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David Shawba2d2c22017-01-23 16:56:38 -06001#!/usr/bin/expect --
2
3# ssh using the parms provided by the caller. The benefit provided by this
4# program is that it will enter the password for you (i.e. non-interactively).
5
6# Description of arguments:
7# Arg0: The password.
8# Arg1: The ssh parm string. This is the totality of ssh parms you wish to
9# specify (e.g. userid, host, etc.).
10
11
12###############################################################################
13# Main
14
15 # Get arguments.
16 set password [lindex $argv 0]
17 set ssh_parms [lreplace $argv 0 0]
18
19 eval spawn ssh ${ssh_parms}
20
21 set timeout 30
22
23 set max_attempts 3
24
25 set attempts 0
26 while { 1 } {
27 incr attempts 1
28 expect {
Michael Walsh823a7ff2017-10-20 10:36:07 -050029 -re "Offending RSA key in (.*?)\[\r\n\]" {
30 # We have been informed by ssh that we have a bad key.
Gunnar Mills28e403b2017-10-25 16:16:38 -050031 # Retrieve the file path and line number from the ssh output.
Michael Walsh823a7ff2017-10-20 10:36:07 -050032 set fields [split $expect_out(1,string) ":"]
33 set file_path [lindex $fields 0]
34 set line_num [lindex $fields 1]
35 # Use sed to delete the bad key.
36 set cmd_buf "sed -i ${line_num}d ${file_path}"
37 puts "Issuing: ${cmd_buf}"
38 eval exec bash -c {$cmd_buf}
39 # Kill the failed spawned ssh process.
40 exec kill -9 [exp_pid]
41 # Start a new process now that our stale key problem is fixed.
42 eval spawn ssh ${ssh_parms}
43 continue
44 }
David Shawba2d2c22017-01-23 16:56:38 -060045 -re "assword:" {
46 send "$password\r"
47 break
48 }
49 -re "Are you sure you want to continue connecting" {
50 if { $attempts > $max_attempts } {
51 puts stderr "**ERROR** Exceeded $max_attempts attempts to ssh."
52 exit 1
53 }
54 send "yes\r"
55 }
56 timeout {
57 puts stderr "**ERROR** Timed out waiting for password prompt."
58 exit 1
59 }
60 eof {
61 puts stderr "**ERROR** End of data waiting for password prompt."
62 exit 1
63 }
64 }
65 }
66
67 set timeout 3
68 expect {
69 "Permission denied, please try again." {
70 puts ""
71 puts "**ERROR** Incorrect userid or password provided to this program."
72 exit 1
73 }
74 }
75
76 set timeout -1
77
78 # We don't ever expect to see this string. This will keep this program
79 # running indefinitely.
Michael Walshaecfce02017-10-10 16:30:21 -050080 set never_string "When in the course of human events, it becomes :"
81 if { [ catch {expect { "${never_string}" {send "whatever\r"} }} result ] } {
82 set child_died {expect:[ ]spawn[ ]id[ ]exp4[ ]not[ ]open}
83 if { [regexp -expanded ${child_died} $result] } {
84 # The child died. This is not necessarily an error (for example, the
85 # user may have included a command string to run on the target).
86 exit 0
87 } else {
88 puts $result
89 exit 1
90 }
David Shawba2d2c22017-01-23 16:56:38 -060091 }
92
93 exit 0
94
95###############################################################################
96